What are the factors that influence the hydrogen sulfide desulfurization performance of potassium carbonate in vacuum?

The temperature of the gas entering the desulfurization tower, the temperature of the washing liquid, the potassium carbonate content in the washing liquid (operations in the acid removal tower), and the salt concentration in the circulating liquid – all these factors mean that the vacuum potassium carbonate process achieves a lower desulfurization efficiency compared to other processes.

1. Influencing factors: lean liquid spray density, content of by-products in the desulfurization lean liquid, bottom temperature of the desulfurization regeneration tower, vacuum level in the regeneration tower, and heating method of the regeneration tower； 2. How it has an impact: · The high content of by-products in the desulfurization lean solution results in poor absorption capacity of the desulfurization liquid; especially when the gas contains high levels of ammonia, this causes the desulfurization liquid to change color and its quality to deteriorate significantly ； ·Poor control of the regeneration temperature in the regeneration tower can result in poor quality of the desulfurization lean liquid and a decline in its desulfurization capacity ； ·Appropriately increasing the vacuum level can improve the regeneration effect, thereby indirectly enhancing the desulfurization effect ； ·The hot water source for vacuum potassium carbonate production generally comes from the hot water in the upper section of the primary cooler. If the coke ovens at the front end utilize rising pipe waste heat recovery technology to extract the heat from the gas, and if the amount of ammonia water used for spraying is not reduced, this will lead to a decrease in the amount of hot water available. In such cases, steam must be added at the bottom of the regeneration tower to provide heating; however, steam is usually supplied on one side only, which causes localized overheating at the bottom of the regeneration tower, accelerates the growth of by-products, and deteriorates the desulfurization solution. 3. Solutions: · Slightly increase the vacuum level ； ·A stable and consistent hot water supply is an essential guarantee for the desulfurization regeneration process; the temperature at the bottom of the tower should be maintained between 55 and 65 degrees℃ ； ·Control the ammonia washing level at the front end to prevent excessive ammonia levels in the gas ； ·Regular maintenance and cleaning of the mist catchers at the top of the front-end unit are carried out promptly to prevent impurities such as oil droplets from entering the desulfurization system ； Currently, no significant effect of absorption temperature on the desulfurization efficiency has been observed